Abstract
A new concept of molten salt reactor (MSR) is proposed. The new concept is a static-fuel-type MSR (S-MSR) which is composed of a cylindrical core tank filled with molten salt fuel typically such as FLiNaK added with a few % of minor actinides (MAs) and plutonium and a vessel surrounding the core tank, filled with fluoride molten salt such as FLiNaK, acting as the primary coolant. The primary coolant is cooled with heat exchangers located inside the coolant vessel. Burning / transmutation rate of TRU elements in this reactor was evaluated to show as high as over 50%, a very high value. This type MSR is extremely safe from the viewpoint of severe accident since the molten salt fuel is confined in the core tank without circulation outside of the core. So, this type MSR can be expected to be applied to drastically reduce the amount of high level radioactive waste recovered from the spent fuels of the nuclear power plants including the fuel debris from the damaged reactors of Fukushima-Daiichi Power Station.
